fix: grant admin role to anonymous user and add DEFAULT_TOOL_VIEW env var

When AUTH_ENABLED=false, the anonymous user was assigned the "user" role
which lacks settings:write permission, making all settings saves return
403. Since no admin exists when auth is disabled, settings were
permanently read-only. Promote the anonymous user to "admin" so the
single user has full control of the instance.

Also adds DEFAULT_TOOL_VIEW env var (sidebar|fullscreen) following the
existing DEFAULT_THEME pattern, seeded via ensureDefaultSettings() on
first boot.

Closes #135

apps/api/src/index.ts

@@ -63,6 +63,7 @@ function ensureDefaultSettings() {
   const defaults: Record<string, string> = {
     defaultTheme: env.DEFAULT_THEME,
     defaultLocale: env.DEFAULT_LOCALE,
+    defaultToolView: env.DEFAULT_TOOL_VIEW,
   };
   for (const [key, value] of Object.entries(defaults)) {
     const existing = db.select().from(schema.settings).where(eq(schema.settings.key, key)).get();

apps/api/src/lib/env.ts

@@ -27,6 +27,7 @@ const envSchema = z
     WORKSPACE_PATH: z.string().default("./tmp/workspace"),
     DEFAULT_THEME: z.enum(["light", "dark", "system"]).default("light"),
     DEFAULT_LOCALE: z.string().default("en"),
+    DEFAULT_TOOL_VIEW: z.enum(["sidebar", "fullscreen"]).default("sidebar"),
     CORS_ORIGIN: z.string().default(""),
     MAX_USERS: z.coerce.number().default(0),
     LOG_LEVEL: z.enum(["fatal", "error", "warn", "info", "debug", "trace"]).default("info"),

apps/api/src/plugins/auth.ts

@@ -847,13 +847,11 @@ function isPublicRoute(url: string): boolean {
 
 export async function authMiddleware(app: FastifyInstance): Promise<void> {
   app.addHook("preHandler", async (request: FastifyRequest, reply: FastifyReply) => {
-    // When auth is disabled, attach a synthetic non-admin user so tools work
-    // but admin-only routes (user management, settings write, etc.) stay locked
     if (!env.AUTH_ENABLED) {
       (request as FastifyRequest & { user?: AuthUser }).user = {
         id: "anonymous",
         username: "anonymous",
-        role: "user",
+        role: "admin",
       };
       return;
     }